To clarify the distinction between speed and velocity, and to review qualitative
ID: 1268673 • Letter: T
Question
To clarify the distinction between speed and velocity, and to review qualitatively one-dimensional kinematics.
For the following questions neglect air resistance. Pay particular attention to whether the answer involves "absolute" quantities that have only magnitude (e.g., speed) or quantities that can have either sign (e.g., velocity). Take upward to be the positive direction.
Which ball has the greater average speed during the 1-s interval after release (assuming neither hits the ground during that time)?
Which ball has the greater average speed during the 1-s interval after release (assuming neither hits the ground during that time)?
the ball thrown upward the ball thrown downward Neither; the average speeds of both balls are the same.Explanation / Answer
answer with reason
While both the balls start out at v0, the on thrown down accelerates and reaches a speed greater than v0 at t1. The ball thrown up, decelerates and reaches a speed less than v0 at t1. Therefore, the average speed of the ball thrown down is greater than the average speed of the one thrown up.
answer : the ball thrown downward
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